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Urinary Bladder Matrix Scaffolds Promote Pericardium Repair in a Porcine Model.

Natalia Amigo1, Juan Martin Riganti2, Mauricio Ramirez2

  • 1Instituto de Medicina Traslacional, Trasplante y Bioingeniería (IMeTTyB), Universidad Favaloro-CONICET, Buenos Aires, Argentina.

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|February 1, 2020
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Summary

Urinary bladder matrix (UBM) scaffolds effectively promote pericardial repair after cardiac surgery, reducing adhesions and fibrotic tissue formation. This biomaterial shows promise for improving patient outcomes by restoring native tissue properties.

Keywords:
Biological scaffoldExtracellular matrixPericardium repairRegenerative medicineUrinary bladder matrix

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Cardiovascular Surgery

Background:

  • Pericardium closure after cardiac surgery is crucial to prevent sternal adhesions.
  • Current synthetic materials yield suboptimal results due to poor tissue remodeling and fibrosis.
  • Urinary bladder matrix (UBM) scaffolds offer potential for constructive remodeling, mimicking native pericardial tissue.

Purpose of the Study:

  • To evaluate the host response to UBM scaffolds for pericardial repair in a porcine model.
  • To assess the efficacy of UBM in preventing adhesions and promoting tissue regeneration compared to an open defect.

Main Methods:

  • A partial pericardial resection model was created in 12 pigs.
  • Pericardial defects were closed with UBM patches or left open (control).
  • Evaluations included gross morphology, biomechanical testing, histology, and cardiac function over 8 weeks.

Main Results:

  • UBM group exhibited mild adhesions; control group showed significant fibrosis and robust adhesions.
  • Biomechanical testing revealed lower load at failure and stiffness in UBM compared to native pericardium.
  • Histology demonstrated native-like tissue with neovascularization in the UBM group, contrasting with fibrotic tissue in the control group.

Conclusions:

  • UBM scaffolds are suitable for pericardial repair, promoting constructive remodeling and reducing adhesions.
  • UBM demonstrates potential to restore pericardial tissue properties and prevent associated complications.
  • The findings support UBM as a promising biomaterial for cardiac surgical applications.